Friction securing device



1943 E. c. HORTON FRICTION SECURING DEVICE Filed July 18, 1940 Fig.4.

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Yank, ATT RNEYS Patented Jan. 26, i943 STA FRICTION SECURING DEVICEErwin C. Horton, Hamburg, N. Y., assignor to Trico Products Corporation,Buffalo; N. Y.

6 Claims.

simple design which may readily be stamped and shaped bysimpleoperations and which when applied to a stud or shank willeffectively secure itself thereto against unauthorized displacement.

Fasteners of this general type have heretofore been designed but havenecessitated the removal of excess material by specially constructeddies. The present invention utilizes simple punch operations inproducing a fastener which is strong and effective as a securing device.

Fig. 1 is a plan view of the improved fastener embodying the presentinvention;

Fig. 2 is a cross section therethrough with the dotted lines indicatingthe manner of applying the fastener to a stud or shank;

Fig. 3 is a longitudinal section showing schematically the several punchoperations in the production of the fastener;

Fig. 4 is a fragmentary section of a strip of stock material showing thesuccessive steps in the formation of the fastener;

Figs. 5 and 6 are views similar to Fig. 4 in which the order or sequenceof operations have been slightly altered.

Referring more particularly to the drawing, the numeral I designates theimproved fastener, the same being herein depicted as of circular shapeand having a flat marginal or peripheral base 2 with a central portion 3of substantially truncated conical formation. This central portion isprovided with a circular series of openings 4, three being illustrated,and these openings are interconnected by an axial or central opening 5which results in a composite hole of lobate or scalloped design, havingedges 6 intervening the openings 4.

The openings 4 and 5 are preferably round, being more economicallyformed as such, and consequently the edges 6 will be arcuate in extentand may be conformed to the round stud or shank l, in Fig. 2, for moreeffective securement. The fastener is conveniently applied to the studby exerting pressure on the base 2, as through a tubular tool 8 whichcauses the annular base to seat upon the body 9 from which the stud 1projects.

The circular shape of the openings 4 results in the formation ofradially disposed fingers Ill which flare inwardly toward the studreceivin opening 5 and give substantial support to their arcuate stud enaging seats or edges 6. The

opening 5 is preferably punched before the central portion is given itsconical shape, so that when this shape is imparted the lower corner ofthe arcuate edge will be disposed to provide a biting part to firmlyengage or embed itself into the stud I, as shown in Fig. 2. The openings4 are spaced inwardly from the marginal base 2 so as to provide a solidand continuous conical section II for supporting and connecting thefingers I0 and thereby afford added strength to them. By reason of thecone shape the gripping fingers are also bowed transversely to reducetheir flexibility and render their stud engagement more secure. Theopenings provide ample clearance to insert a tool for disengaging thefingers when it becomes necessary to remove the fastener.

Referring more particularly to Figs. 3 and 4 a strip of stock materialI2 is fed through a punch machine. Preferably, the strip is first formedwith the central opening 5 by a punch i3 and then the circularlyarranged openings 4 are produced by the tri-punch member I l. Thereafterthe central portion 3 is given its conical shape by forming dies I5 aundfinally the completed fastener is struck from the strip by the punch I6and its cooperating die II. Intermediate these operations suitable pilotmembers I8 are provided to maintain the strip I2 in proper alignment.

Fig. 5 illustrates a sequence of steps wherein the circular series ofopenings 4 are initially formed and subsequently joined by the centralopening 5. Or if it is desired to go to the expense of making a singlepunch of trilobate or otherwise multilobate design the scalloped holemay be punched in a single operation, as depicted in Fig. 6, and thisfollowed by the conical shaping of the central portion.

From the foregoing it will be observed that the several steps of themethod comprise simple punching and shaping operations; that theresulting fastener is strong and durable; and that while the descriptionhas been given in much detail, it has been so stated to illustrate theinventive principles involved and not by way-of restriction to the scopeand spirit defined in the appended claims.

What is claimed is:

1. A separable fastener having a truncated conical body with the upperside portion thereof interrupted by circular openings defining up- 2. Aseparable fastener having a truncated conical body with the sidesthereof interrupted by circular openings defining shank gripping partseach with its upper extremity widening toward a shank engaging edge.

3. A fastener having a marginal base and an upwardly extending centralconical portion with a shank receiving opening defined by inwardlyextending parts formed with shank gripping seats of arcuate formconcentrically related, said parts being separated by circular openings,the adjacent seats being formed by a central opening intersecting thecircular openings in their upper arcs thereby to impart an upward flareto the parts in the conical portion.

4. A fastener having a conical portion uninterrupted at its lower edgeand having its upper edge defined by upwardly extending fingerstransversely bowed in conformity with the conical shape, the upperextremities of the fingers defining a central stud receiving openingwith the opening defining walls of the upper edges being flaredoutwardly to present the lower corners of the edges for bitingengagement with a received stud.

5. A fastener adapted to be applied to a shank by axial movementthereover, comprising a body of hollow truncated conical shape havingits upper periphery interrupted by a plurality of openings forming aplurality of shank gripping pa ts therebetween, said shank grippingparts provided with wide shank gripping edges each supported by arelatively narrowed neck to provide a resilient support for the grippingedge whereby the shank gripping part may yield outwardly from the sideof the conical body in passing over the endof a shank when appliedthereto.

6. A fastener adapted to be applied to a shank by axial movementthereover, comprising a body of truncated conical shape having its upperperiphery divided into a plurality of shank gripping fingers by aplurality of openings, each finger having a shank engaging edgesupported by a narrowed flexible neck portion of the body of less widththan the shank engaging edge whereby the finger may flex outwardly fromthe side of the conical body in passing over the end of the shank, saidbody having a flanged base,

portion extending uninterrupted partially up the sides of the cone to aplane from which the neck portions originate to support the relativelywider gripping edge.

ERWIN C. HORTON.

